<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css</title>
    <link rel="stylesheet" href="11.css">
<!--嵌入式引入-->
    <style>
        span{
            color: red;
        }
    </style>
</head>
<body>
<!--内联使用,不推荐,但方便-->
<p style="color: green">pppppp</p>
<span>嵌入式css</span>
<a href="#">外部式的css引用</a>
</body>
</html>
